How the color of the glass bottle is formed?

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Among the glass bottles, in addition to the colorless and transparent glass bottles that we often see in our daily life, there are many colorful glass bottles, including brown glass medicine bottles, green beer bottles, and blue oral liquids. Bottles etc. In the cosmetics industry, there are blue and green essential oil bottles, which are packed in modern glass bottles in various colors.


green boston round glass bottle

How do these beautiful glass colors come from?


Ordinary glass bottles are made by smelting quartz sand, soda ash and limestone together. Its color is not consciously added by people, but the result of impure raw materials used and mixed with impurities. At that time, colored glass bottles were only used for decorations, and the requirements were not high. People only produced colored glass by accident.


After research, it was found that if 0.4 to 0.7% of colorant is added to the ingredients of ordinary glass, the glass can be colored. Colorants are mostly metal oxides. If these oxides are added to the glass batch, the glass will be colored.


For example, if chromium oxide (Cr2O3) is added, the glass will appear green; if manganese dioxide (MnO2) is added, the glass will appear purple; if cobalt oxide (Co2O3) is added, the glass will appear blue. This is the protective eyepiece used by steel workers and electric welders. Kind of glass.


In fact, the color of glass bottle glass not only depends on the added colorant, but also adjusts the valence of the elements through the melting temperature and the nature of the furnace flame to make the glass show different colors.


Now, people use rare-earth element oxides as colorants to make various high-grade colored glasses. Colored glass doped with rare earth elements has a clear hue, a bright color, and even changes the color under different light. For example, neodymium oxide glass has this characteristic. It appears purple-red under sunlight and blue-violet under fluorescence, which is very beautiful.


In addition to rare earth elements, tungsten and platinum are directly added to the glass to make color-changing glass.


Ordinary pigments fade due to the ultraviolet rays in the sun or the action of oxygen and sulfur dioxide in the air; but colored glass can withstand the sun and rain because the metal and other oxides that play the role of coloring have been melted into the glass. Soak and keep its beautiful youthful appearance forever. With the increasing development of science and technology, the varieties of colored glass will become more and more colorful, and our lives will become colorful because of its embellishment and decoration.


Simply put, by absorbing, reflecting, and transmitting light of a certain wavelength, it presents different colors of glass. Mainly used for doors and windows of public facilities in buildings and decorative materials for interior and exterior decoration. Glass coloring has two processes: material coloring and surface coloring.


Material coloring

The process of adding substances capable of forming colored ions, compound colloids and metal colloidal particles to the glass raw materials to make them appear different colors can be divided into four types according to the coloring mechanism.


①Ion coloring.

②Coloring of compound colloidal particles.

③The metal colloidal particles are colored.

④Semiconductor coloring.


Surface coloring

It is to coat metal, metal oxide, etc. on the glass surface to form a transparent, translucent or opaque color coating. Coating SnCl4 and FeCl3 on the glass surface by chemical thermal decomposition method can produce blue SnO2 film and golden Fe2O3 film respectively. Using vacuum evaporation, vacuum cathode sputtering, reactive sputtering and other methods, metal films such as gold, silver, copper, etc. or metal oxide films such as In2O3, SnO2, TiO2, etc. can be prepared, which can be formed due to the difference in film thickness and refractive index. Interference film and reflective film of different colors.


After a long time of learning and innovation, Iboya can also produce and supply colored glass bottles, such as our boston round bottle, european dropper bottle and roll on bottle. If you want to know more about our products, you can send us an email.